Permanent Bed Platform Levelling Blocks for the Qidi Plus 4

Summary
 

Designed to fit over the Z-stepper mounting bolts in the base of the print chamber (see photo).

The model is a single piece. Print two of them.

Discussion
 

When doing a platform calibration, the printer will bring the print bed to the bottom of the chamber in an attempt to home and level the platform. The problem is that the bottom of the print-bed carrying frame is slightly curved, and the left and right stepper motors can end up "fighting" as to who is more dominant with the see-saw style motion that the print bed frame imposes. This can result in the print bed slanting quite heavily to one side instead of the intended homing to a flat surface.

These pieces provide a flat surface that meets the flat portion of the bracing ribbing under the print bed before the curved portion meets the base of the chamber. This prevents the see-saw rocking motion of the unassisted bed homing. Each Z-stepper instead meets a hard flat stop point that each stepper can then reference a home position against. These homing blocks are low and flat enough to leave installed full-time, and don't need to be removed after installation. The stock print bed has approximately 285mm of total movement range, and the use of these blocks reduces that to 283mm, which is still 3mm more than the 280mm Z-range that the print supports when printing. Basically there is no loss of usable printing Z-range when using these blocks. They only come into play when doing the platform leveling calibration sequence.

Best printed in a high temperature tolerant filament such as ASA, ABS, PET, PA, PC. I used PET-CF myself. Also best to give a very light sanding of the top surface after printing to remove all small high-points that may impact Z-axis homing consistency.

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