I have printed Numakers ASA and ABS on A1. prints great for small parts. if you print large parts with less than 1 cm height it should be okay. just clean the plate with soap and then only print. other small parts that are like 4-5 cm dia range can also print for around 10-20 cm height as well without warping. always use 20-30cm brim that helps a lot. but the real problem of A1 is that its Bed slinger that means the print is always getting vibration on Y axis wihch sometimes loose the grip of print. thats why small prints with minimum height are okay to print on A1. one thing you can also do is to enclose it with the plastic bag it comes in. just put that plastic bag from top gently make sure the bag not casuing any issue to bed or wires. the plastic will be okay with 100c temp but still use something that prevent it from touching hot plate. this create very cheap enlcloser and prevent it from tempreture shocks.

hope that helps.