If you have been 3D printing for a while, you may have already tried the most common slicer settings like layer height, infill density, speed, temperature, and others. However, not everyone bothers to dig into the deeper parts of the 3D slicer to explore all the other settings, especially those available in the advanced tab or hidden behind a drop-down menu. It’s easy to assume the defaults are enough, but many lesser-known settings can seriously change your 3D printing game regarding print quality. Below, we uncover the five settings everyone overlooks and why they matter.

6 Acceleration control

Fine-tune the 3D printer speed

The acceleration control setting is found under the speed settings. It determines how quickly your printer changes speeds when moving. While print speed sets the maximum speed, acceleration controls how fast the printer ramps up and down from that speed.

A higher acceleration makes prints faster, but they will be a bit shakier and less accurate due to vibrations. Lower acceleration slows printing but improves quality, especially on small features and corners. If you are 3D printing detailed prints, lower the acceleration to around 500-1000mm/s. You can go up to 3000-5000 mm/s for mechanical or rapid prototyping if your 3D printer can handle it. You can also set different acceleration values for walls, infill, and top surfaces. You can try this setting to get the right speed for your prints.

5 Z hop when retracted

Prevent the nozzle from leaving marks on the print

Z hop when retracted setting lifts the nozzle slightly when retracting and moving across the print. This is a simple move, but helpful in preventing the nozzle from dragging across the surface, which avoids ugly scars or imperfections, especially on delicate top layers, and it also prevents the nozzle from knocking the print from the build plate. You can find it under the travel settings.

Use this setting when 3D printing small or detailed models where surface finish matters. Also, for flexible filaments that are prone to oozing, it can help improve the printing. Also, you can use it when you see scratches forming on your print surface. As you use this setting, remember that it increases the print time.

4 Ironing mode

Reduce layer lines on the top surface of the print

Ironing smooths the top surface by moving the nozzle over without extruding or with minimal flow. This melts and flattens the top layer, reducing layer lines and improving aesthetics. It’s excellent for prints with visible top layers, flat and exposed surfaces like the top of a box or enclosure. If you are 3D printing lithophanes or decorative objects, you can benefit from this setting too. When you enable this setting, you will see other settings appearing that you can use to fine-tune it further. For example, you can iron only the highest layers, choose the ironing pattern, line spacing, speed, and acceleration. Adjust them and see how they affect your print.

3 Arc fitting

3D print round objects perfectly and reduce the G-code file size

If you are using the Bambu Studio slicer, you can find the Arc fitting, sometimes called G-code optimization. It’s a setting that allows the slicer to replace multiple small straight-line movements, that is, G1 commands with arc commands, G2, and G3, when generating G-code. Instead of approximating curves by stacking lots of tiny straight segments, this feature fits circular arcs into the tool path. This reduces the size of the G-code and results in smoother printer motion and more precise circular prints, which are especially noticeable in rounded objects. You can use this setting when 3D printing curved parts like gears, vases, and rings. If your G-code file is getting excessively large, use this setting to reduce the size, but before using it, remember to check your 3D printer or firmware to see if it supports G2/G3 commands.

2 Initial layer flow

Improve the first layer of the print

Getting the first layer right is crucial for print success, and the initial layer flow value can help you achieve this. Increasing it for just the first layer ensures better adhesion, as it slightly squishes the filament to grip the bed. But be careful because if it's too high, it can cause elephant’s foot or over-extrusion problems. The default value is usually 100-105%, and you can try to increase it to 110% if your prints don’t stick well.

Also, try lowering the first layer speed or increasing the first layer temperature and see the difference it makes. As you do so, ensure you have done bed leveling correctly and tuned the Z-offset for the best results. In Cura, you can find it among the first-layer settings.

1 Minimum bridge wall length

Tune how your slicer handles the bridges

This setting determines whether the slicer should generate bridge walls along the edges of a bridge, based on the length set. Cura will skip creating those outer walls if the bridge is shorter than the value you set here. This helps avoid cluttering small bridging areas with unnecessary lines that could lead to messy extrusion or poor print quality. If the minimum bridge wall length is too low, Cura might add bridge walls even to tiny areas where they’re not needed, which can result in stringing or blobs.

On the other hand, setting it too high might prevent bridge walls from being added to moderately sized bridges, which could lead to sagging. A good starting point is around 5 mm, but you can experiment with higher or lower values depending on your printer and filament type. This setting is helpful when printing detailed models with small bridges between fine features.

Get the most out of your 3D slicer

It’s easy to fall into the habit of hitting “slice” without checking the advanced settings, especially when the defaults work okay most of the time. But these hidden slicer settings are worth trying if you’re looking to explore other settings to get better surface quality, faster prints, cleaner bridges, or fewer artifacts. So take a few minutes to explore them and try tweaking just one or two of these settings on your next print. You might be surprised by how much better things turn out and the difference they will make.