This model is best printed in a material with a little bit of flexibility, like PETG, ABS, or ASA. The holes are sized for M3 screws to be used directly without tapping. Just mount a couple of these on the bottom of your MASSO relay module and clip it to a DIN rail in your control cabinet.
The author remixed this model.
This version of the clip is sized specifically for the MASSO CNC relay module.