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How to Fix Parts That Are Too Tight to Fit?

Robotime kits are laser-cut with high precision, but occasionally a part may feel too tight when fitting into a slot, joint, or screw hole. Before forcing the piece, try a few simple adjustments. In most cases, light sanding, wax, or a small adjustment to the screw is enough to solve the problem without damaging the model.

Tight Part Fix Guide

01

Check the Part Orientation First

Before sanding or adjusting anything, make sure the part is facing the correct direction and fully aligned with the assembly diagram. A piece that is rotated, reversed, or slightly misaligned can feel much tighter than it actually is.

Tip: Compare the part with the instruction diagram and test the position gently before making any changes.
02

Lightly Sand Tight-Fitting Areas

If two wooden parts rub against each other or feel too tight to fit together, lightly sand the contact area using fine-grit sandpaper. Focus only on the edge, tab, or surface that is causing friction.

Remove only a small amount of material at a time and test-fit frequently. It is much easier to sand a little more than to repair a loose fit caused by over-sanding.

Community tip: Many experienced builders sand only the areas that rub against each other, then test the fit again before continuing assembly.
03

Reduce Friction with Wax or Soap

For moving parts, gears, sliders, drawers, rotating mechanisms, and even tight screws, a small amount of wax or soap can help reduce friction and improve movement.

Apply only a thin layer to the contact surface or screw thread, then test the fit again. Remove any excess before continuing assembly.

Community tip: Robotime Community member @Jerry_Boswijk shared that during a Space Shuttle build, a screw going into a plastic cog was difficult to install because of friction. Rubbing the screw over a bar of soap or wax made it much easier to turn. View the community post →
04

Never Force a Tight Part

If a part still feels excessively tight after checking the fit, sanding lightly, and inspecting the slot, stop and investigate further. Forcing a part into place is one of the most common causes of broken tabs, cracked pieces, and damaged assemblies.

Rule of thumb: If it feels wrong, stop. Check the orientation, clean the slot, sand gradually, and test-fit again.

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