MPMD adjustable magnetic bed clip

thingiverse

Note: The latest version is likely your best bet. I've left older versions up for anyone who'd rather use them, but the latest version does not have to line up with any bed holes and can sit farther back from the bed. I was pleased with my customized magnetic bed clips that held down the MPMD bed and a borosilicate glass cover but found information on Dennis Brown's Facebook group indicating that an adjustable clip offers better leveling performance. https://www.facebook.com/groups/mpminideltaowners/permalink/2058169440865198/ I thought I'd see if I could design a magnet version of this clip to test its effectiveness. To try and improve the adhesion of the clips, I: 1. used two sets of magnets to increase the magnetic surface area (previous versions had one) 2. printed the clip in two parts to ensure that the bottom of the clip was as smooth as possible 3. printed without a brim to minimize any trimming that may be necessary Each clip uses: - 1 arm from a 15mm binder clip - 1 M3 bolt (<6mm) - I found some small flathead Phillips bolts lying around that fit perfectly. - (2+) 12x3 mm neodymium magnets (2 or 3 will fit inside the opening) It's probably a good idea to glue in the magnets, as they have a tendency to fly out and attach themselves to nearby metal. Check Dennis' post for information on how his clips are intended to be set up. *Edit (13/03/2019)*: I've added a new version of the clip that is a single print (no gluing) but does require supports. This needs to be printed upside down so the peg is at the top. The magnets are moved closer to the front and the tightening bolt goes through the peg. It can therefore be a little longer as it will not hit the base. There are four different sets of holes for the binder clips. Choose whichever works best for you. The peg is tight and may require some sanding to fit the positioning hole. *Edit 2 (30/05/2019)*: I've added a new low-profile version. Since I use a glass bed, I have a few extra mm so there's little chance of the effector hitting the clip when probing. However, without the extra mm, it is possible for the effector to hit the clip if the head of the screw is too large. This low-profile version is about 2mm shorter and is moved back slightly from the bed. If the screw head is too large, this will still be a problem, but this version should help. Note: I've removed the two-part bed clip as it's not as good a choice as the one-piece clips. If you're using screws with large (tall) heads, you're probably better off selecting the low-profile version, especially if you're not using a glass bed. *Edit 3 (07/10/2019)*: I've redesigned the bed clip to use a hex nut and an M3 6mm bolt. This new clip does not require a hole in the floor of the printer. Instead, it just sits on the floor surface and can be positioned wherever you choose to put it. It has a front hole that can be used with a small bolt for an alignment pin but that's optional. It will take several different-sized binder clip arms but you may need to do some trimming if the arms are a little tight. You can use the Litho Frame Column Shields and this Bed Clip together as there is just enough room for both to fit. The advantage of this clip is that it can be positioned farther from the bed, and therefore the effector will not hit the calibration screw head when probing to the edges of the bed, which may happen with the others if you're probing on the standard surface. *Edit 4 (07/10/2019)*: I've updated the redesigned clip to allow a little more clearance for the nut and the magnets. I've also increased the magnet spacing to allow a little extra room for the binder clip arms as well as adding an additional hole in order to utilize the smallest binder clips. Keep in mind that if you use the smallest binder clip arms (15mm), the bed clip has to be moved closer to the bed. The 20mm clips are probably a better choice. Since the spacing between the magnets has been increased, you may need to spread the binder clip arms slightly in order for them to fit nicely into the holes. See that additional notes below for more information about the arms.