Can’t you change the screws ? Try to find a similar screw but with a different head.
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Maybe you should try to tie a magnet to a rope and throw it under your furniture to find it back.
otherwise, I’m sure that ultimaker support will help you either with the right size you need or by sending you new ones
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Most of the screws should be 2 mm allen key. Ultimaker 1 or 2?
Stephan
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Ultimaker isn’t English, it’s a Dutch company…
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I had this problem in our case we put it down to nackered screws. They must use cheap ones
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key23d
9
you will need a 2 mm hex key.
Kind regards, Guy
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Ivar
10
I am going on a leap here and guess you bought Imperial keys, If so, try Metric keys (2mm). They should fit. Dutch manufacturer.
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They are standard metric readily available even in USA ( Mcmaster Carr problems). Ultimaker is from Holland not UK.
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Ivar
12
Ultimaker is from the Netherlands, not UK. 
Yep-- they’re metric, not SAE. Most of them are 1.5mm & 2mm, with the really tiny ones at 1mm. If your local big-box hardware store doesn’t have a set with the smaller sizes, check a local RC hobby shop or (much cheaper): http://smile.amazon.com/dp/B00I5TH074
Cheers, Dennis
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Chayak
14
Ultimaker along with most 3d printer manufacturers use metric with printers so you’ve likely bought imperial sizes.
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I think it is very likely that you purchased SAE Allen wrenches rather than metric Allen wrenches. If you get the metric ones you should have no more problems. Please let me know if you have anymore questions
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Wow guys, thanks for such great response! we actually bought them in Amsterdam so its pretty silly that they don’t have something fitting. The one I have here seems to fit well, but its like a tiny bit too loose… I am afraid that the part itself might be worn out or something 
Here’s how it looks. It’s not really a screw actually… It’s just this spot that is very difficult to reach
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Thanks for the tip, unfortunately, its not the case. See picture above, it’s for a different thingie.
haha! That’s a good idea for finding the tools! Sadly, it has been lost for a while now I don’t think they are anywhere near the printer 
It’s Ultimaker 2, sorry for not specifying!
bg3d
21
I believe they are all metric Hex keys. I found them at a local ace hardware. Also they asked me if the tiny one was for my guitar so I’m assuming they are standard for that as well. Maybe check out a guitar center or something similar.
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Thats, 1,5 mm hex. But you can remove the Hotend Isolator (the part with the holes) and then screw the bolt out of the hole. For reassembly screw the bolt in your heater block (it hold the temp sensor and heater). Then screw the hotend isolator (see above) on the heater block. The aluminium plate on the photo has no thread for the bolt, so you stick the heater block with the bolt through this tiny hole.
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For Ultimaker1 they included a 2mm hex screwdriver for the many hexagon socket screws. Mine was a Wera model #118068 (05118068003). Most cheap sets of METRIC hex key sets should include a 2mm wrench that would work. Ensure you get the metric set and not the SAE set.
They also provided a 1.5mm hex L-shaped key for the set screws of the z-axis lead screw. Hope it helps!
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