Semi-automatic Bed Level Probe
thingiverse
This budget-friendly, micro-switch based bed level probe offers reliable results for less than $1. Semi-automatic and lightweight, it attaches to the extruder or carriage and requires a calibration routine (G29 in Marlin or G32 in Repetier). Its quick-mount design allows easy installation on Kossel printers, with adjustments possible for other models using OpenSCAD or Customizer. The probe delivers 20 micron repeatability, with the combined accuracy of printer, probe, and switch all under 20 microns—ideal for most prints. Manual probes may seem outdated amidst hopes for fully automatic sensors; however, this simple tool can significantly improve print quality, surpassing the Kossel original Allen key probe and proving more reliable than the FSR solution. OpenSCAD/Customizer options generate variants to fit various printers and carriages, accommodating 1/2" (small) and 20mm (large) micro-switches. Additional parts include an optional 12mm M3 thumb screw and hex nut. Repetier's Tools->Bed height map and Excel can generate height maps, while instructions for Repetier setup are available online at http://www.repetier.com/documentation/repetier-firmware/z-probing/.
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