Recommended environment / enclosure  

RE: Recommended environment / enclosure

below 15C the printer mintemp safety guard kicks in, so you may find it difficult to start prints without warming the enclosure. 

If the enclosure maintains a higher temperature   during the print, you may find that you have issues with PLA Prints... due to heat creep, if the extruder cooling fan is unable to cool the extruder heatsink sufficiently... 

the electronics and powersupply, don't like elevated temperatures so people often site them outside the enclosure... 

However, most datacomms cabinets are made of steel, if the external temperature is 10C to 15C, you may find that there is sufficient heat transfer through the steel walls and top, to maintain a reasonable temperature inside the enclosure, without forced cooling. 

most datacomms cabinets have ventilation at the top and open bottoms with relatively poor fitting doors, so the cabinet is likely to act like a thermal pump / chimney, and ventilate heat out of the top

enclosures are usually  provided to:

1, Look pretty (keep the associated paraphenalia tidy) which can include the filament feed reels

2, create  controlled environment with a raised temperature to prevent higher temperature prints de-laminating,

3, keep nosey people's fingers out... 

4, control fumes,

5, reduce humidity

6, a combination of the above

so you have a number of contending factors...   

PLA rarely needs an enclosure,      PETG is more tollerant of enclosures  ABS is likely to delaminate in a cold environment. 

If your enclosure does indeed capture heat and retain it, you may find that PLA is problematic, leaving the enclosure door open would usually be enough to resolve this issue, but would then not keep nosey fingers out...  

if your enclosure needs a fan, to vent the excess heat out of the cabinet, there is a probability that cold incomming air could cause delamination with ABS. 
 
Some filaments require more management than others  PLA and PETG are relatively resilient. PVA, TPU, and Nylon are comparatively hygroscopic.   putting the filament dispenser inside the cabinet may reduce the relative humidity and reduce moisture absorbtion...

If you can obtain a  taller datacomms cabinet, you could consider putting an electric dehydrator in the bottom and the printer on a higher shelf, with perhaps filament storage inside if sufficient space exists. 

with a little ingenuity it would be possible to put a filament spool holder inside the dehumidifier and use a reverse bowden  feed to transport the filament from the dehumidifier to the extruder,  note, you would need to provide some sort of 'buffer' or 'rewind' facility, to prevent the extruder back feeding filament to the spool and causing knots... 
https://www.thingiverse.com/thing:2764643

the dehydrator could double as a heat booster to raise the temperature inside the cabinet above 15C to help start printing. you could try running some test prints and monitor the temperature change inside the cabinet and perhaps use Gaffer tape to control drafts and air leakage from the cabinet if necessary. 

if you find that the temperature is getting a bit high inside the cabinet, you could consider using a fan, (INSIDE THE CABINET) with a hose, to transfer the heated air from the top, to the bottom to provide a more even thermal gradient. this may be sufficient to mitigate your heat dissipation needs by making the entire cabinet wall surface area into a heat transfer facility,  if sufficient, this would probably preclude drafts making sensitive filaments less likely to de-laminate, however creating a sealed environment would prevent the dehydrator from working efficiently. so you wouldn't want to completely seal the cabinet... 

At the end of the day, we don't know enough about your particular setup to give you absolute answers, but the above information should help you move forward. 

regards Joan

RE: Recommended environment / enclosure

@joantabb

Thank you Joan for your very thorough answer, it really helped med think about certain things.

I think that I will start by trying out printing inside the cabinett and have some heat sensors in different places. As I read in another thread the recommended temperature by Prusa was a maximum around 40C so I would want to stay somewhere around 20-40C but rather around 20-25C.

When the MK3s arrives I will start tinkering with this and maybe get back with some photos.

RE: Recommended environment / enclosure

Good Luck! 

Joan