what printer do you have?
Make sure to level the bed properly, on an Ultimaker2 just use the procedure with a tin piece of office paper. On an Ultimaker3 if you use autoleveling make sure to keep the nozzles clean.
Also use the correct bed adhesion method, If you print in PLA either make sure the glass is VERY clean (rub with alcohol) or use a bit of gluestick. When using gluestick put just a few lines on the glass, then wipe over the whole bed using a piece of slightly wet paper towel, you want just a very thin layer of glue.
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Tristan 0
A few things to check are: Is your bed level? Did you disable your fan for the first layer? Did you use a glue stick or painters tape to help the print adhere?
If you did all these things check this out:
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