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Cannot install Olsson Block - can't remove set screw

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I can't remove the set screw in the hot-end to remove the thermistor and heater cartridge.

Only the smallest of the 3 hex-drivers that where included with the UM2 fits but it seems to be slightly too small and doesn't catch.

...either that or the screw is alreasy stripped. (This is the first time I'm laying hands on that screw.)

What size is it supposed to be? T4?


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Fixed it. I was able to borrow some off-size micro-torx set and remove the bolt.

The heater-cartridge slipped out more or less easily.

...the thermistor didn't. :(

Where to get a new thermistor and how to install it?

I have one of these expensive UM2 hotend-sets but it doesn't include a thermistor. Only the mechanical parts.





Edited by Guest

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is absolutely right. You need a spare PT100B. When I got my UM2extended (after reselling my former UM2) there was no spare PT100B included.

This is a MUCH better instruction then the one given on the Ultimaker website. (That I was using since I purchased the upgrade there and expected it to work.)

The Ultimaker Store has that 1eur  PT100B sensor here


but it's 37,50eur + VAT = 45eur + shipping =   €48,90

By experience the UM store ships via Fexed B2B carrier. So It's something like 22+eur and I cannot receive it because I'm not a business with an office open every day Mo-Fr 8-16:00.

The shop doesn't seem to work with the network here. After login nothing happens.

3dSolex links to http://www.goodtube.uk/ for Europe. They don't list anything else but the Olsson Block.

http://www.imakr.com/eu/en/order is 55eur including shipping with no mention what shipping company they use.

...I just ordered it to my hotel room in Hamburg directly from Ultimaker.

There was no way to leave a comment during the checkout process to say,

that it MUST arrive before the congress is over (2015-12-30) simply because I'm

no longer in that hotel afterwards and the printer is needed DURING the congress.

Edited by Guest

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How to check?

There are no markings.

What shipping company does 3dsolex use and where to find the PT100B in their European store?

If they use a regular parcel service instead of a courier and Ultimaker fails to deliver in time, I may need to cancel my order with Ultimaker and order somewhere else anyway.

Edited by Guest

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now idea what shipper Carl is using.... if your in a hurry maybe check the resellers.


f.e. I see that Didier (belgium) has them in stock, mail our call him if yr in a hurry...


The're cheaper at E3D - http://e3d-online.com/Spares/PT100 - but not in stock atm.

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