If your probe or nozzle fall into a hole, your print will be severely compromised. At best, the V-One will catch the error as a probing error, and at worst the nozzle will break because the error was not caught.
Probes / nozzles falling into a hole can happen for a number of reasons:
- Drill file not loaded or incorrect. If there is a hole present in the board that the V-One is not aware of, it will fall in. Ensure that the drill file is loaded at the start, that the drills are the right size, and that all drills or holes are present.
The V-One will only load holes in the plated through holes / vias file. If your probe is falling into a mounting hole, that means you have a feature inside of the hole! Edit your design accordingly.
- Alignment problem. If using aligned printing, ensure that the alignment is done correctly - significant offsets can cause the probe to fall into the hole.
- Manually drilled holes. If using holes that are drilled by hand (instead of an automated tool), there will inherently be some variability in the placement of the holes, which means that the V-One can accidentally fall into a misplaced hole. To avoid this problem, do the following:
- Increase the hole size so that the diameter is about 0.5 mm larger than the actual drill size you'll use.
- Increase the pad size so that there are at least concentric circles when loaded in the V-One software. A safe bet is a radius at least 0.3mm larger than the oversized hole.