Laser Pointer Mount and Case to use a cheap laser printer to calibrate your 3D printer

Mount is designed to use a standard Hypercube (HEVO) as originally designed by Scott3d. With the case the idea is to glue a magnet onto the case so you can then stick it onto a motor or other magnetic part of your printer

Cheap pointer I have is 13.2mm in diameter by the removable end dome and 13mm elsewhere

The idea is that you insert the pointer into the mount/case with the power button located by the botch at the top. When you insert it, the button is pressed and stays on until you remove the pointer. There is a small X shaped slot in the end of the mount/case that, kind-of, throws a line rather than a point of light.

Put a ruler, preferably non-reflective, on the bed of your printer so that the laser shines on the beginning of the mm scale. Then move your printer, X or Y, by a fixed amount - say 120mm. Check where the laser now points. If it is not 120mm away from the start point you need to adjust your steps. For Z you need to fix the laser pointer somewhere where it can shine on a ruler that is placed vertically on the hot bed, then do the same as for X & Y. Use this site for the calculations https://www.maxzprint.com.au/stepps-per-mm-calculator/.

Check your printer settings for current X, Y & Z step settings

Not 100% perfect but quicker than printing a cube. Yes, I know material shrinks etc but I feel this is a good calibration method for me, simply sharing it

Be careful with lasers, even laser pointers can be dangerous

Update Original design just had a slot, as you can see on some images. This was fine for X axis but not great for Y, so I added a version with anX slot