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elfworks

Monoprice Select Mini Bed Level Calibration Test

by elfworks May 5, 2017
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This is a great print! Thank you for such a simple and easy to use test! With a simple pair of calipers, you're able to measure the height differences between all four corners, and the center.

Thank you for coming up with, and designing such a great test!

The screws holding the bed of the Monoprice Mini have a thread pitch of 1mm.
(Based on my measurements. Please correct me if I'm wrong.)

On my V1, they are metric M3 screws with a standard pitch of 0.5 mm.

Yeah, I think you're correct.

I've updated the notes.

Thanks!

Used another print to get my bed height right, and then realized that it wasn't level. This was the perfect print to get it leveled out again. Thanks!

Glad to hear it worked. Thanks!

Can someone explain how to use this? I'm not quite sure how it works, but I know I need it :)

I use it to fine tune my bed height.
You have to use the print settings listed in the description.

Print it out and watch the first layer go down.

As it prints the first layer, you can tell if any of the corners are at the wrong height.
If the corner is too high, the extruded filament looks too flat, and adjacent passes squish together. (Turn that corner screw clockwise a bit to lower the bed.)
If the corner is too low, the extruded filament looks too round, and adjacent passes don't properly fuse together. (Turn that corner screw counter-clockwise a bit to raise the bed.)
If the bed is at the right height, the first layer should be firmly adhered to the bed, and the adjacent passes should be fused together, with just the slightest bit of rounding on top. (Here's a good example I found by Googling '3d printer proper bed height': https://i.stack.imgur.com/AbVDV.png )

I usually tweak the screws while the print is going, and just keep re-printing the first layer until I'm happy with the settings.

Finally, if you let it finish printing, you can use calipers to verify that it's printing correctly on all axes. The different layers are calibrated at .5mm, 1mm, & 5mm, the squares are 10mm x 10mm & the outer square is 100mm x 100mm. The wall thickness is .8mm.

I've noticed that when loaded into cura, the corner squares don't touch the bed. is that intentional? The bottom of the entire model is marked in red.

Not intentional. :)

This was one of my early models, and it's just a bunch of overlapping objects.

Cura marks it in red, but if you switch the view mode to Layers, you'll see it slices properly.

Ah, I see. I've printed it a number of times, but i've had to mess with settings to get the corner squares to actually print properly because they sit off the bed.

If you slice it using the supplied settings, you shouldn't have any adhesion issues.

Look at the Layers view in Cura.

If your corners aren't sticking, you have bed adhesion/height issues.

It's not about them not sticking, its that there wasn't any paths on the bottom layer for the outside edges of the corner squares. see: https://imgur.com/rN3nMA3

That's weird?!?

I'm using Cura 2.7.0.

Is wall thickness set to .8mm?

It would seem enabling cura's "union overlapping volumes" "fixes" the problem.

Thanks for following up with a solution to the problem!

I was able to replicate your problem. (I had enabled that option many moons ago, and forgot that it wasn't on by default.)

I knew the model was a mess, but it always sliced correctly for me. You're the first to mention the error.

I have rebuilt the model so it slices properly, and saved it in STL format. (Even got the preview to show up correctly.)

Thanks again for helping me fix this problem.
Cheers!

Not a problem at all :) it confused the crap out of me a while back, and I only just loaded it up a gain and saw it, and had to re-figure out the issue.

Excellent for calibrating the base height. I ran the print and played with the screws while it printed to get a good height. I noticed immediate results with my next print. As noted, you only need to print the first layer for plate calibration.

Thanks elfworks!