Do these 3 things before closing this tab:
1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsFor most FDM prints, start at 10–20% infill. Move to 20–30% when the part needs noticeably more mass or compression resistance, and increase perimeter count before simply filling the entire interior. Prusa Research reports that 10–20% is its tested general balance, while its current guidance says densities above 30% are rarely needed for ordinary models. Infill adds weight and supports top layers, but wall strength, print orientation, layer bonding and load direction can matter more than density alone.
There is no universal percentage that guarantees a load rating. The right setting depends on whether the part is being crushed, pulled through its walls, loaded from several directions, or weighted mainly for stability.
As an Amazon Associate I earn from qualifying purchases.
Quick settings guide
| Goal | Starting setting | Pattern or adjustment | Why and trade-off |
|---|---|---|---|
| General-purpose functional print | 15–20% infill | Use a balanced pattern and check top-layer coverage | Fits Prusa Research’s tested 10–20% balance without the material and time penalty of a very dense interior. |
| Noticeably heavier part | 20–30% infill | Raise density gradually; use a local modifier if only one area needs mass | More internal plastic increases weight, filament use, cost and print time. Prusa says densities over 30% are rarely needed for ordinary models. |
| Compression-loaded part | 20–30% plus more perimeters | Use additional walls around the load-bearing shell | Infill helps resist compression, while perimeter count contributes most of the model’s overall strength. |
| Loads arriving from many directions | Your selected density with gyroid | Keep the same density while changing the pattern | Prusa describes gyroid as three-dimensional, strong in all directions and efficient for its strength-to-weight ratio. |
| Completely solid interior | 100% | Rectilinear | Rectilinear is the only pattern Prusa recommends at 100% density. Expect substantially higher material use and print time. |
| Large part where material and time matter | 10–20% to start | Adaptive cubic | It concentrates material near walls and top or bottom surfaces and uses approximately 25% less material than rectilinear while maintaining similar mechanical properties, according to Prusa. |
These are starting points rather than engineering specifications. A part’s geometry, material, wall count, layer bonding, orientation and load direction can change the result substantially.
Free tools Windows power users keep installed
One-click scans. No signup required.
What infill actually changes
Weight
Infill is plastic inside the outer shell. Increasing its percentage places more plastic in the same volume, so the finished part becomes heavier. The relationship is not perfectly linear in every slicer because walls, top layers, bottom layers and pattern spacing also consume material, but a move from 10% toward 30% is a practical way to add internal mass without making the entire object solid.
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
Weight matters when a printed base needs to resist tipping, a fixture should stay in place, or a handheld object needs more heft. It does not automatically make a part safer under every load: added mass can increase the force a moving or dropped part experiences, and a heavy object can put more stress into its mounting points.
Compression resistance and internal support
Infill gives the top and bottom skins something to rest on and creates internal columns or surfaces that can carry compressive loads. It is therefore useful when the part is being squeezed, when a broad top face would otherwise bridge a large void, or when you need a stiffer interior.
Infill is not the only source of strength. Prusa Research states: “The strength of a model is mostly defined by the number of perimeters (not infill).” That distinction explains why a 100% infill setting can consume a great deal of filament without delivering a proportional improvement in every type of strength.
The Tool Desk
Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Print time, cost and appearance
Higher density means more extrusion paths. UltiMaker’s documentation identifies the resulting trade-offs: higher density can improve strength and top-surface support, but it also increases material consumption, cost, weight and print time. Dense patterns can also change the way the top surface is supported and how internal vibrations are produced during printing.
Choose density by the job
For a normal functional part
Use 15–20% as the first trial. Prusa Research’s 2021 article says, “Our testing revealed that the best density setting is 10-20%, and we implemented this value in our PrusaSlicer profiles.” Treat that as a profile recommendation from Prusa, not a universal engineering law.
Slice the part, inspect the preview and print one copy. If the object is too light, too flexible in compression, or has unsupported top skin, move upward in small increments rather than jumping directly to 100%.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
For a visibly heavier object
Start at 20% and test 25% or 30% if the result is still too light. Prusa’s current infill guidance allows more density for heavier or stiffer parts but says infill above 30% is rarely needed for ordinary models. Once you reach that range, consider whether the extra mass is worth the additional filament and print time.
PC Slower Than It Used to Be?
A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Crashes, No Sound, or Screen Glitches?
Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteFor compression
Begin with 20–30% infill and increase the number of perimeters around the outside. Compression loads can be carried by the internal structure, but the shell still needs enough walls to prevent buckling, splitting or local deformation. A small increase in wall count may achieve more than a large increase in infill.
For a part loaded in several directions
Choose gyroid at the density you already selected. Prusa describes gyroid as a three-dimensional pattern with strength in all directions, relatively quick printing and a good strength-to-weight ratio. It is a sensible default when you cannot predict one dominant load direction.
For a part that only needs ballast in one region
Do not automatically make the whole model dense. Place a modifier volume or other localized infill region in the slicer, assign a higher density to that region, and leave the rest at a lower setting. A dense lower section can add ballast while preserving lighter infill elsewhere, provided your slicer and model support modifier meshes or region-specific settings.
Perimeters versus infill: what to change first
Perimeters are the continuous shells printed around the outside of each layer. They control much of the part’s resistance to bending, pulling and splitting through its walls. Infill is more influential for compression, internal support and mass.
- Identify how the load enters the part. If screws, hooks, clips or bending loads act through the outer wall, increase perimeters first.
- Add infill for compression or internal support. Raise the density when the part is being crushed or when top surfaces need support.
- Recheck the preview. More walls can leave less room for infill in small sections, so inspect narrow features and holes after slicing.
- Print a representative test. A short sample containing the critical wall, joint or hole is more useful than testing an unrelated shape.
This approach avoids the common mistake of selecting 100% infill for a part whose actual failure begins at a thin wall, layer seam or poorly oriented joint.
Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
Picking an infill pattern
| Pattern | Best use | Characteristics | Limitations |
|---|---|---|---|
| Gyroid | Multi-directional loading and balanced strength-to-weight needs | Three-dimensional structure; Prusa describes it as strong in all directions and relatively quick | It is not a guarantee of equal real-world strength in every geometry or material. |
| Rectilinear | 100% infill or a straightforward directional structure | Prusa’s recommended pattern for a completely solid interior | A solid interior uses much more material and time than a sparse interior. |
| Adaptive cubic | Large parts where material and print time matter | Places more material near walls and top or bottom surfaces; approximately 25% less material than rectilinear with similar mechanical properties, according to Prusa | Its density is not uniform, so inspect areas around thin features and load paths. |
| Honeycomb | When a cell structure is specifically useful for the design | Provides mechanical resistance | Prusa reports approximately 25% more material use and up to twice the print time compared with its reference pattern. |
| Grid or other crossing-heavy patterns | Cases where the slicer’s standard pattern is acceptable | Crossing lines can provide support and stiffness | Crossing-heavy paths can be noisier and may raise failure risk on some printers; evaluate the preview and the machine’s behavior. |
Is gyroid stronger than grid?
There is no single answer independent of geometry, material and load direction. Gyroid is the better-supported choice when forces arrive from many directions because Prusa characterizes it as directionally balanced. A grid-like pattern can be adequate for simpler loads, but crossing-heavy paths may create more vibration or noise on some machines. Compare the actual failure mode rather than treating a pattern name as a guaranteed strength rating.
Step-by-step slicer workflow
- Open the model and confirm the material profile. Make sure the selected filament and printer profile match the machine. For PLA, use a compatible profile rather than copying temperatures from an unrelated material.
- Set the initial density. In PrusaSlicer, open Print Settings and then Infill. Enter 15–20% for a general functional part, or 20–30% for a heavier or compression-loaded part.
- Select a pattern. Choose gyroid for loads from several directions, adaptive cubic when saving material and time on a large part matters, or rectilinear only when you intentionally need a 100% interior.
- Set perimeter count before extreme infill. In Print Settings, open the shell or perimeter controls and add walls when the load is carried through the exterior. The exact label can vary by slicer version.
- Slice and inspect the toolpath. Check that top surfaces have enough support, that thin sections are not being consumed entirely by walls, and that the pattern reaches the region you intend to strengthen.
- Use a modifier for local mass. Add a modifier mesh or region, assign a higher infill value to that region, and preview the transition. Keep the dense area away from moving clearances and threaded features unless the design requires it.
- Print a test piece and record the result. Note the density, pattern, perimeter count, layer height, filament and orientation. Change one major variable at a time so you can identify what improved the part.
How to add weight without making the whole print solid
Concentrate infill where it changes stability
If the purpose is ballast, mass near the base usually affects tipping more efficiently than uniform density throughout a tall object. Use a localized high-density region in the lower section and keep upper sections at the normal starting density. Preview the transition carefully so the slicer does not leave a weak shelf or unsupported top surface at the boundary.
Raise density in stages
Move from 10% to 15%, then 20% or 30%, and compare the actual mass and handling. This staged approach reveals whether the extra plastic is solving the problem before you pay the full time and material penalty of a solid interior.
Use compatible filament
For a physically heavier object, PLA 3D printer filament in the printer’s compatible diameter is a direct consumable option. The common 1.75 mm format is suitable only where the printer is designed for it. Confirm filament diameter, temperature profile and material compatibility before loading a spool; do not assume that every machine accepts every filament format.
When 100% infill makes sense
A solid interior is appropriate when voids would undermine a specific design requirement, when machining or drilling a solid printed block is part of the workflow, or when you deliberately accept maximum material use for a small part. It is not a universal “strongest” switch.
Prusa identifies rectilinear as the only pattern it recommends for 100% infill. A fully dense object takes substantially longer and consumes substantially more filament than a 10–30% version. It can also expose weaknesses elsewhere: a thin outer wall, poor layer bonding, an unfavorable print orientation or a sharp stress concentration can still cause failure.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
Use 100% only after identifying why a sparse interior is failing. If the problem is a top surface collapsing over a void, more top layers or a targeted support region may solve it. If the problem is wall bending, more perimeters may be the more efficient change.
Top-layer support and surface quality
One of infill’s primary jobs is supporting top layers that would otherwise bridge empty space. A very low density can leave long unsupported spans, producing sagging, gaps or a rough top surface even when the side walls are strong enough.
Inspect the sliced preview from the top and side. Look for broad roof-like areas, bridges over cavities and transitions around modifier regions. If only the top skin is poor, raising the entire model to 50% or 100% may be wasteful; a modest density increase, additional top layers or a locally denser region can address the actual defect.
Material, time and cost trade-offs
| Change | Expected effect | What to watch |
|---|---|---|
| 10% to 20% infill | More mass, internal support and compression resistance | Longer print and higher filament use; verify that the gain is needed. |
| 20% to 30% infill | Further weight and stiffness increase | Diminishing returns become more likely; Prusa says above 30% is rarely needed for ordinary models. |
| More perimeters | Better wall-driven strength and resistance to splitting | Small internal cavities can disappear; check holes and clearances. |
| Gyroid instead of a simple pattern | More balanced behavior for multi-directional loads | Actual performance still depends on orientation, geometry and material. |
| Adaptive cubic on a large model | Approximately 25% less material than rectilinear, according to Prusa | Inspect the variable-density zones around thin walls and top surfaces. |
| Honeycomb | Mechanical resistance with a distinctive cell structure | Approximately 25% more material and up to twice the print time, according to Prusa. |
Use the slicer’s estimated filament length, mass and print time after every change. Those estimates are more useful for your exact geometry than a generic percentage-to-weight conversion.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshooting by symptom
The part is too light
- Raise infill from the current value toward 20–30%.
- If only the base needs mass, use a localized dense region instead of densifying the whole object.
- Confirm that the slicer estimate changed as expected after slicing.
The part bends through its walls
- Increase perimeter count before selecting extreme infill.
- Check print orientation so the load is not concentrated across weak layer interfaces.
- Inspect holes, corners and thin sections for stress concentrations.
The part crushes under compression
- Increase infill toward 20–30%.
- Add perimeters around the compressed shell or contact area.
- Use a pattern that provides support through the relevant region and verify the top skin in preview.
The top surface sags
- Inspect the void beneath the top layers.
- Increase infill modestly or add a local dense region under the broad span.
- Do not assume that 100% infill is required for every top-surface problem.
The printer becomes noisy or the print fails in the infill
- Preview crossing-heavy patterns such as grid and watch for abrupt direction changes.
- Try gyroid or adaptive cubic at the same density and compare the machine’s behavior.
- Check that the nozzle is not scraping raised infill lines and that the first layers are sound before increasing density again.
Examples for common decisions
A weighted display stand
Start with 15–20% infill for the body. If the stand still tips, add a 25–30% modifier region in the base rather than filling the entire column. Increase perimeters around the foot if it flexes at the wall. Check the top surface only where a broad span needs internal support.
A bracket under compressive load
Begin at 20–30% infill with additional perimeters around the mounting holes and the loaded edge. The pattern matters less than ensuring the shell and layer orientation support the actual force path. Print a small section containing the hole and corner before committing to a long production print.
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
A large enclosure
Use 10–20% as the initial range and consider adaptive cubic to reduce material. Add local density under broad top panels and around attachment points. A uniform 100% interior would increase time and cost without necessarily fixing a weak wall or fastener area.
A small solid-looking part
If the part is tiny and the slicer naturally leaves little internal space after walls and top or bottom layers, 100% infill may have little practical difference from a dense shell. Use rectilinear if you intentionally select 100%, but still check whether the limiting feature is a perimeter, layer seam or orientation.
How to validate strength safely
Vendor guidance provides useful starting ranges, not a universal tensile-strength table for every printer and filament combination. Final performance depends on geometry, material, wall count, layer bonding, orientation and load direction.
Quick wins for a faster PC:
Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →- Define the failure you are trying to prevent: tipping, bending, crushing, splitting, hole pull-out or surface collapse.
- Choose one density and one pattern that fit that load, then keep other major settings constant.
- Print a representative coupon or a sacrificial version containing the critical feature.
- Apply the expected load gradually and observe where deformation begins. Do not infer a safe working load from a single successful sample.
- Change perimeters, infill or orientation based on the observed failure location, and document each iteration.
Without part-specific testing, no percentage can promise a particular load rating. The most reliable setting is the lowest one that passes your own geometry-specific test with an appropriate safety margin.
Bottom line
Use 10–20% infill for most prints, 20–30% for extra weight or compression, and increase perimeters first when the shell carries the load. Choose gyroid for multi-directional forces, adaptive cubic when saving material and time on a large model matters, and rectilinear only for a deliberately solid interior. Preview every slice, use local modifiers when only one region needs ballast, and validate the finished design rather than treating infill percentage as a guaranteed strength specification.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
