This print allows you to use your iPad while rowing.  It is designed to slip onto the PM5 monitor of a Concept2 rowing machine.  Please note that you need to ensure that the thumb screw for the PM5 is tight enough to stop it falling forward/backwards with the additional weight.

Rather than print with supports, I opted to screw the two pieces together.  I used M4 x 20mm screws.  

This may also fit the older PM4, but please check the dimensions (the PM5 measures 123mm x 20mm - looking down from the top).

I have included the 3MF file from Prusa Slicer so you can see where I placed a modifier to allow the bottom support to be printed at 100% infill.  This may not have been necessary, but I figured better safe than sorry!  I also printed the slip on adapter at 60% to be safe.  Both printed in PLA.

This is a remix of an iPad stand that I found on Thingiverse (https://www.thingiverse.com/thing:1403920).  This remix also uses a honeycomb pattern rather than the original slats (as they proved impossible to print for me).  I also had an accessory from Concept that I modeled as the slip on holder that screws to the underside of the iPad holder.