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I assume you did everything according to instruction but here is a checklist of what could be possibly wrong.

1. friction - check if you can rotate/move parts without lot of resistance
2. screws - check if screws on couplings are tight and they don't slide over a shaft or thread
3. stepsticks - check if they are cooled properly and similar (as there are two of them)
4. caret carriage nuts on threads - chcek if they do not slide out of their nests while caret carriage goes up
5. filamet - check if filamet unrolls without resistance which can eventually hang caret
   
   IMO #2 and #3 are the most possible cause

I assume you did everything according to the instructions but here is a checklist of what could be possibly wrong:

1. Friction - check if you can rotate/move parts without lot of resistance
2. Screws - check if screws on couplings are tight and they don't slide over a shaft or thread
3. Stepsticks - check if they are cooled properly and similar (as there are two of them)
4. Carriage nuts on threads - check if they do not slide out of their nests while [the x-axis] carriage goes up
5. Filament - check if filament unrolls without resistance which can eventually cause [the x-axis] carriage to hang.

IMO #2 and #3 are the most possible cause

I assume you did everything according to instruction but here is a checklist of what could be possibly wrong.

1. friction - check if you can rotate/move parts without lot of resistance
2. screws - check if screws on couplings are tight and they don't slide over a shaft or thread
3. stepsticks - check if they are cooled properly and similar (as there are two of them)
4. caret nuts on threads - chcek if they do not slide out of their nests while caret goes up
5. filamet - check if filamet unrolls without resistance which can eventually hang caret
   
   IMO #2 and #3 are the most possible cause

I assume you did everything according to instruction but here is a checklist of what could be possibly wrong.

1. friction - check if you can rotate/move parts without lot of resistance
2. screws - check if screws on couplings are tight and they don't slide over a shaft or thread
3. stepsticks - check if they are cooled properly and similar (as there are two of them)
4. caret carriage nuts on threads - chcek if they do not slide out of their nests while caret carriage goes up
5. filamet - check if filamet unrolls without resistance which can eventually hang caret
   
   IMO #2 and #3 are the most possible cause

I assume you did everything according to instruction but here is a checklist of what could be possibly wrong.

1. friction - check if you can rotate/move parts without lot of resistance
2. screws - check if screws on couplings are tight and they don't slide over a shaft or thread
3. stepsticks - check if they are cooled properly and similar (as there are two of them)
4. caret nuts on threads - chcek if they do not slide out of their nests while caret goes up
5. filamet - check if filamet unrolls without resistance which can eventually hang caret
   
   IMO #2 and #3 are the most possible cause

I assume you did everything according to instruction but here is a checklist of what could be possibly wrong.

1. friction - check if you can rotate/move parts without lot of resistance
2. screws - check if screws on couplings are tight and they don't slide over a shaft or thread
3. stepsticks - check if they are cooled properly and similar (as there are two of them)
4. caret nuts on threads - chcek if they do not slide out of their nests while caret goes up
5. filamet - check if filamet unrolls without resistance which can eventually hang caret
   
   IMO #2 and #3 are the most possible cause