Gridfinity holder

is a gridfinity option made originally for calculators, i have 2 that aren't the same size so i made them with a little more space, they are not a perfect fit but i didn't want to leave any marks in my calculators by making them slide constantly against the walls, so they stand with a little bit of an angle.not ideal for cellphones because they are too skinny but you can make them work or resize the holder to get a perfect fit.i use one with the stop wall and one without the stop wall because this way i only use 4 gridfinity grids instead of 5.the files that say (smaller holes) have 26mm holes and the ones that just say gridfinity holder have a 30mm hole.for calculators i recommend the ones that are 26mm, the other ones fit my earbuds case.