Aiming sight for LabRadar chronograph

thingiverse

My LabRadar case halves don't line up perfectly. The target side half on mine sticks up slightly above the shooter side half at the top where these things are mounted. As a result it forced the sight to point upwards, which means when aligning the device using it the device is aimed downwards. It was quite the angle difference with mine, and I was having weird readings from the signal bouncing off the ground, I am guessing. As I'm shooting 22 LR I need to use the doppler trigger method, and if it was aimed down too much it would start triggering for no reason and giving me weird phantom readings in the 400-600 fps range just from leaves floating by and stuff like that, haha. I solved this for my unit by moving the screw hole/stub down 1 mm and removing the front half of the underside meant to ride in the slot on top of the unit. This way it is only riding in that slot for the shooter side half and not really touching anything on the target side half. For my unit this made it align way better. A spirit level placed on the back of the unit showed level at the same time as one placed on top of the printed sight. My signal to noise ratio went from about 30 dB to 42-43 dB and it will now track those little 22 LR bullets past the 100-metre mark, whereas before it would start dropping below 10 dB by the time it got out to just 60 or 70 metres. So for me, these little changes made aiming the unit much more accurate.